Merge tag 'samsung-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into fixes

Merge Samsung fixes for 3.16 from Kukjin Kim:

- use WFI macro in platform_do_lowpower because exynos cpuhotplug
  includes a hardcoded WFI instruction and it causes compile error
  in Thumb-2 mode.
- fix GIC reg sizes for exynos4 SoCs
- remove reset timer counter value during boot and resume for mct
  to fix a big jump in printk timestamps
- fix pm code to check cortex-A9 for another exynos SoCs
- don't rely on firmware's secondary_cpu_start for mcpm

* tag 'samsung-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: EXYNOS: Don't rely on firmware's secondary_cpu_start for mcpm
  ARM: EXYNOS: fix pm code to check for cortex A9 rather than the SoC
  clocksource: exynos_mct: Don't reset the counter during boot and resume
  ARM: dts: fix reg sizes of GIC for exynos4
  ARM: EXYNOS: Use wfi macro in platform_do_lowpower

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

3 files changed, 16 insertions, 18 deletions

diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 69fa4839739..8a134d019cb 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -46,13 +46,7 @@ static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
 		if (cpu == 1)
 			exynos_cpu_power_down(cpu);
 
-		/*
-		 * here's the WFI
-		 */
-		asm(".word	0xe320f003\n"
-		    :
-		    :
-		    : "memory", "cc");
+		wfi();
 
 		if (pen_release == cpu_logical_map(cpu)) {
 			/*
diff --git a/arch/arm/mach-exynos/mcpm-exynos.c b/arch/arm/mach-exynos/mcpm-exynos.c
index 0498d0b887e..ace0ed61747 100644
--- a/arch/arm/mach-exynos/mcpm-exynos.c
+++ b/arch/arm/mach-exynos/mcpm-exynos.c
@@ -25,7 +25,6 @@
 
 #define EXYNOS5420_CPUS_PER_CLUSTER	4
 #define EXYNOS5420_NR_CLUSTERS		2
-#define MCPM_BOOT_ADDR_OFFSET		0x1c
 
 /*
  * The common v7_exit_coherency_flush API could not be used because of the
@@ -343,11 +342,13 @@ static int __init exynos_mcpm_init(void)
 	pr_info("Exynos MCPM support installed\n");
 
 	/*
-	 * Future entries into the kernel can now go
-	 * through the cluster entry vectors.
+	 * U-Boot SPL is hardcoded to jump to the start of ns_sram_base_addr
+	 * as part of secondary_cpu_start().  Let's redirect it to the
+	 * mcpm_entry_point().
 	 */
-	__raw_writel(virt_to_phys(mcpm_entry_point),
-			ns_sram_base_addr + MCPM_BOOT_ADDR_OFFSET);
+	__raw_writel(0xe59f0000, ns_sram_base_addr);     /* ldr r0, [pc, #0] */
+	__raw_writel(0xe12fff10, ns_sram_base_addr + 4); /* bx  r0 */
+	__raw_writel(virt_to_phys(mcpm_entry_point), ns_sram_base_addr + 8);
 
 	iounmap(ns_sram_base_addr);
 
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index 87c0d34c7fb..202ca73e49c 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -300,7 +300,7 @@ static int exynos_pm_suspend(void)
 	tmp = (S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0);
 	__raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
 
-	if (!soc_is_exynos5250())
+	if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
 		exynos_cpu_save_register();
 
 	return 0;
@@ -334,7 +334,7 @@ static void exynos_pm_resume(void)
 	if (exynos_pm_central_resume())
 		goto early_wakeup;
 
-	if (!soc_is_exynos5250())
+	if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
 		exynos_cpu_restore_register();
 
 	/* For release retention */
@@ -353,7 +353,7 @@ static void exynos_pm_resume(void)
 
 	s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
 
-	if (!soc_is_exynos5250())
+	if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
 		scu_enable(S5P_VA_SCU);
 
 early_wakeup:
@@ -440,15 +440,18 @@ static int exynos_cpu_pm_notifier(struct notifier_block *self,
 	case CPU_PM_ENTER:
 		if (cpu == 0) {
 			exynos_pm_central_suspend();
-			exynos_cpu_save_register();
+			if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
+				exynos_cpu_save_register();
 		}
 		break;
 
 	case CPU_PM_EXIT:
 		if (cpu == 0) {
-			if (!soc_is_exynos5250())
+			if (read_cpuid_part_number() ==
+					ARM_CPU_PART_CORTEX_A9) {
 				scu_enable(S5P_VA_SCU);
-			exynos_cpu_restore_register();
+				exynos_cpu_restore_register();
+			}
 			exynos_pm_central_resume();
 		}
 		break;